Machine-switching telephone-exchange system.



H. P. CLAUSEN.

MACHINE SWITCHING TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED FE'B. s. 1911.

Patented Sept. 3, 1918.-

Henry f. C/aase/r.

3mm i=. CLAUSEN, or MOUNT VERNON, NEW Yoax; ASSIGNOR roi-wns'rnnuntmmoCOMPANY, moonronyrnn, on NEW- YORK, N Y a conronmmon F mew YORK.

'M-ACHINE-BWITCHING TELEPHONE-EXCHANGE SYSTEML Specification 0'1 LettersPatent. Patented Sept. 3, 1918.

Application filed February 5, 1917. Serial No. 14.0362. 1 i

To all whom it may concern I Be it known that I, HENRY P. iLAUSEN, a

citizen of the United States, residing at Mount, Vernon; in the countyfoff VVestchester and State of, New York, ha v eiinvented certain, newand nsefuLl-inprovrnqgnts ln Machine-switching Tele hone-Exchange Sysswitch, may operate a signaling device before an attendant at thecentral office Who niaythen cornlnunicate with such calling party, i 1

Tl e signaling device Talso serves to apprise ,the-attenclantof anunstandard condition existing. in theiconnector ei cuit, andautomatically operated nporithe' creation of. such c ndi on} ,fllie inention is iiiustfated in the accom- Tspnnying dra s ing which showsdiagram nailing nlapticall scrihers the cnc 'nts of a connector switchcmhodying the principles ofthis invention I being shownnn full.

'ceo'ri lance with this invention, a sigdevice is associated with eachconnector switch. A ci'rcnit for operating the signaling-device extendsfrom a 01mm clos mg dev ce, closed when the connector switch l s setthiiongzh acontact of thef'steppmg relay to the igna-ling'fdevice.linIassociation with this elec roinagn etic responsive vhicl will beactuated. if the stepping vibrz fes,itsyar-inature after the cone snitclisjse'. H the,arlnatnvc of theemmmi relay t stafter ,sucl'i vib iati'onin the h iv chit normally occupies during of the. connectorjswitch, acircuit for ng: the Siirnalingi 'dfgv'ice in a way to hit-t connectionwitjgkan nt'tenglirnt is the i from: contact V we ponsiie eyice, 'iingrelayarmat re to t the cell the electrolnag oug 'l'isurd step--- tl'f.however, the "i e a connection between tis o substandard cotiditioiiof'thi connector switch,

and the attendant may comtn'nnicate with "the called subscriber orielease-thej switclii" The calling suhscribers substation is shown at Aconnected through a linefinder indicated diagremmatically at 3, andselector switches 4 and 5," to the connector switch having brushes 7, 8iand 9. Bindisates the substation of a called subscriber.

The invention will he more readily under-' stood fromthefollowing'description of the operation of the system."

.When the subscriber at A removes-his receiver from the hook the linefinder 3 automatically connects his line to "the fii'st selector switch4. The subscriber now sends,

with his dial, aseries of v impulses which sets the switch 4 on theterminals leading to the second selector switch 5. The subscriber dialsagain t yset the brushes of the selector 5 on the termimils'leading tothe connector swihzh'in whose COllilELCt bank te'riniiiates the line ofthe desired subscriber. soon as the switch 5 has been set ac renitlsclosed from ground, lower winding oi relay SR,-

hack contact and inner lower armature of relay CS, lower brushes ofswitches 5, A: and 3, substation A, middle =hr1is'hes of switc'hesS, -tand 5, upper ar riatureancl beck contact of relay CS,.thr,0 ugh theuppei winding of relay SR, to battery andgronnd;

The relay SR is energized and. closes a cir .cnit for slow relay 10 fromground, inner armature and front contact-of relay "SR; throughthewinding of relay 10 'tobattery "and round. The relay 10 is slowt'o'r'elease',

inylpulses, and places ground through itsvu peg; arn'iai'iure and front;contact on there lease tl unld} so as to prevent 'th'e'release" thelinelin'der and select ng the armature of the relay t to ibrate;

Each time irehiy- 'etri cts its a-im'nature a Thesohscrihor now (ii-11sa'rain, cit-using I armature and front contact of rela 10, contact andmiddle lower armature o relay 12, winding of slow relay 11, .throu h thewinding of the primary magnet I. and sideswitch wiper 13 (position 1),to battery and ground. The magnet PM, being intermittently energized,"steps the wipers 7, 8 and 9 to the group of terminals in which the lineof the called subscriber terminates. The slow relay 11 holds up. itsari'naturc during each series of impulsesand closes a circuit fromground, armature and front contact of relay 11, through thc'winding ofthe side- 'switeh escape magnet Esc, to battery and ground. At the closeof this series of impulses, when the circuit tor the relay 11 remainsopen, it breaks the circuit for the n'iagnet Esc., which, indeiinergizing, advances the wipers of the side switch to their secondposition. I

The subscriber now sends the final series of impulses which completes,as before, the circuits for slow relay 11 and for the escape magnet-Esc.Each time that the relay SR is dei nergized a circuit is closed for thesecondary magnet from ground, inner armature and back contact of relaySR, lowerarmature and contact of relay 10, contact and middle lowerarmature of role 12, winding of relay 11, through the wim ing of thesecondary magnet SM, wiper 13 (position 2), to battery and ground. The

magnet SM sets the brushes of the connector switch on the terminals ofthe wanted line. 1

If the wanted line is busy ground will be found on the test terminal andacircuit will be completed through the brush- 9, wiperll (position 2),back contact and inner armature of test relay T, through the winding ofrelay T, back contact and armature of relay 11, through the winding ofthemagnet-Ese, to battery and ground. The

anagnet ESQ. will, therefore, be locked u.

an will prevent the advance of-the site switch into ts third posltion.The tesirelay T, in energizing, closes a locking circuit for itself fromground, lower spring of pri'- ma-ry off-normal contact ION, 111116!armsmagnets Esc. to batter andig1'ound. -;A, circuit is also closed romground at the secondary of the transformer B2, lower armature andcontact of, relay T, wire 2,

lower winding of relay Csflt o ground. "As

a result of this circuit, a distinetivebusy. tone is'sent out over thecall ng 'lmeand the. subscriber hangs" up h s receiver, causing" therelease of the switches in'a manner. to described.

1f the wanted subscribzr is idle, no .gm iiid.

being found by the to t' brush 9,'t he magnet llsc. dcfinergiucs w enthe relay 11 falls tio n desired. "'fWhen the called subscriber answershe} closes at his switchhook a path of low regizing circuit is thereu onclosed for the.

relay 12 from grounder battery, wiper 13 (position 3) winding of relay12, Wiper 14 (position 3), to ground. A circuit for intermittentlyenergizing the ringing relay HR is also closed from grounded battery,

wiper 15 (position 3), bottom armature and contact of relay 16,interrupter I, winding of relay RR- to ground. Each time the relay BRattracts its armature a circuit is closed from an alternating currentsource 25, front contact and armature of relay RR, back contact andinner lower armatureof relay 16, innermost lower armature and contact ofrelay 12, brush 8 through the substation 13, brush 7, contact and upperarmature of I relay 12, outer upper armature and back contact of relay16, through the lower winding of the relay 16 to ground. The si nalingapparatus at the substation B wil be actuated in this circuit, but therelay 16 is marginal and will not energize at this time.

If at this time the calling subscriber be comes impatient and desiresconnect-ion with an attendant, he may, by dialing or by momentarilydepressin his switchhook, vibrate the armature o the stepping relay SR,which, in retracting its armature's, will complete a circuit fromgrounded battery, winding of relay 17, resistance R, contact 26, lowerarmature and back contact of relay SR, wire 19, through the bottomarmature and contact of relay 12 to ground. The

relay 1?, in energizing, locks up from grounded battery, winding ofrelay 17, re-

sistanee R, left-hand armature andfront contact-of relay 17, wire 19,bottom armature and contact of relay 12 to ground;

ating his switchhook', and the armatures of relay SR- return to theirattracted position, a circuit is completed from ground.

through the interrupter 18, 'ijghbhand WV hen the subscriber ceasesdialing, .or operarmature and front contact ojfirelay. 117,

front contact and lower armature of'relay SR, [through the lamp L to-:battery .and v 1 .11'5 The'lamp-L, or any other coni'renjent'si'gground.

naling device or annunciator which}may besubstitut'ed, is locatedv 'at"an iatt'endan ts position and willbe intermittentl over the circuit jiSt'jt'race nntilan attend{ ant" answers the icul slcev directly Ijattehat subscriber, giving him anyinf H 45 release lnagnjet,

relay 16, through ringing trip rel stations A an 5 contact of relay 12,brush 8, substation 5 is locked up from i called supervisory relaysistance from the alternating current source and frontcontact of relayRR, or rounded battery and back contact of re ay RB, through thearmature of relay RR, back and lower inner armature of. relay 16,innermost lower armature and contact- B, brush 7, contact and upperarmature of relay l2, outer upper armature and back contact of the lowerwinding of the ay 16 to ground. The ring- 16 is energized and opens atits bottom armature the circuit for the relay RR so that ringing ceases.The relay l6 grounded battery, upper Winding of relay 16, inner upperarmature and contact of relay 16, lower spring of Contact PON to ground.The relay 16 also completes the talking circuit between sub-- d B, thetalking current .or A. being supplied through the findings of the relaySR, while current for stat. on

is supplied. through the windings of the C5, which ing trip relayenergized until the called subscriber re I tefndant, he may, gization ofthe relay ,placeshis .receiver on its hookC If at any time during theconversation the calling subscriber" desires the attention of an atbycause the ener- 17 and the consequent actuation ofthelamp'li in themanner pre 85 complished when the deenergiza ti'on o the ground irointhe release- Will not be re- 40 from ground. upper :12, botto n armaturelay SR, Wire 19, bottom armature and conever the called visory relay 50open trupter lamp attendant of the condition.

yiousl-y described.

At theclose of'the conversation the release of thezline finder andselectors will. be ac-. fthe relay l0 removes truck (5, but theconnector leased-until both parties have hung up. both parties hang; upa circuit will be closed armature and back contact of relay 10, upperspring ct. contact PON, bottom armature and contact. of relay US,through the winding; of the rcl.ease.-n1ag net Rel, to battery andground, and the being energized, will restore switch to normal. it,howsubscriber "fails I his receiver on its'hook, the called super- CSremains energized and holds bottom armature the circuit'tor thereleasenawet. Whenever this condi tion dbcurs the lamp L will be actuated assoon as the calling subscr'ber hangs up, the circuit being groundedbattery, lamp andback contact of rethe connector at its tact of relay 12to ground. As the inter- 18 isnot included in this circuit, the willburn steadil thus notifying an existence of this unstaudard"Theattendapt may no'w converse with the subscriber at 13,, or, if thesubscriber has left the instrument, she may place a header on the line,

. time, release the connector switch.

held

to replace and, after a reasonable It is thus to be noted that twodistinct are proinethods for operating the lamp L vidcd, the method ofoperation being determincd by the position of the bottom ai'nuitur'e ot'the relay SR.

-What is claimed is:

1. In a machine switching telephone systern, the conibination withtelephone lines and automatic switches including a connector switch forinterconnecting said lines, oi an annunciator associated withsaiclconnector switch, means actuated by a calling subscriber when saidswitch has been set for actuating said annunciator in a characteristicmanner, and means for automatically actuating said ai'inunciator in adifferent manner'during' the existence of a certain unstandard conditionin said assoelated connector switch.

2. In a machine switching telephone system, the combination withtolepl'ione lines, automatic switches including a connector sw tch torinterconnecting said lines means including a stepping relay for settingsaid switches, and an attendants position, of an annunciator at saidposition, an electro a circuit controlled thereby magnetic device, foractuating said annunciator in a characteristic manner, a switch arranged-to be closed. when the connector is in its set position, a circuitcontrolled by the calling subscriber 'l IOI operating said deviceinclud- 'ing said switch, and a contact of, the stepping relay, analternative circuit for oper ating said annunciator in a differentmanner, said circuit including said switch and the alternate contact ofthe step' 'ing relay;

3.,ln a'inachine switching" telephone exchange system, the coi'nbinationwith telephone. lines, means including a connectmswitch forinterconnecting said lines, means including'a stepping relay for se "ingsaid connector switch, an attcnzilants position. an annunciator thereat,a circuit anni'lncia'tor including a front contactoi said steppingrelay, a relay for closing said circuit, a switch closed when theconnector is set .on the called line and a circuit for said lastmentioned relay including a back contact of said said switch. j w

-4. in a machine switching telephone system, calling and calledsubscribers lines, means including a connector switch forinterconnecting said lines, a stepping relay for said connector, asignaling device asso .ciatcd with said connector switch, and meansassociated with said connector switch and dependent upon the operation 9said stepping relay for causing the said s'gnal-ing device to operatecontinuously or i nte'rmittently.

In a mac stepping relay anc ine switching telephone tern, calling andcalled subscribers lines, 7 automatic switches for connecting saidlines,

ill]

circuitto cause the continuous operation of said signaling device.

In witness whereof, I hereunto Sl1l'JSC1il)(. 10 my name this 3rd day ofFebruary, A. l). 1917.

HEN R Y P. CLAUSE N.

